IBM 3174 Reference Guide

Using Your 3270 Terminal as a DEC VT100
Typematic Keys
BREAK Function
A typematic key is a key that repeats Its function when you hold it down. All keys
that are typematic on your 3270 keyboard continue to be typematic, Including Tab,
Return, and keys pressed with CTRL.
The BREAK function acts differently depending on the host application that your
system Is using. This function produces a short break of 0.2333 second; a Shift
BREAK function produces a long break of 3.5 seconds. See your system
administrator for more Information.
The CTRL-Break key sequence generates the answerback message VT10O
EMULATION ANSWER BACK MSG.
Controi Mode/Controi Shift
Control functions are provided by a control key on keyboards where a control key
Is available. Depending on the terminal type, the control key provides either a
Control Shift or Control Mode function. The Control Shift function allows you to
select multiple functions while the control key Is pressed. The Control Mode
function allows you to enter only one control sequence. Both Control Shift and
Control Mode are Indicated by a left-facing arrow displayed In the OIA.
On all keyboards, using the extension mode key or the Extended Select key
followed by the control key Invokes the Control Mode on/off function. See
Figure 1-2 on page 1-8 through Figure 1-4 on page 1-9 for the location of these
keys.
Understanding Your Status Line
The status line gives you Indications of the operating state of your terminal.
Symbols, characters, and numbers appear In the status line to Inform you of
conditions; for example. If your keyboard Is locked. If It Is In upper shift, or If the
system Is busy. Refer to Table 2-9 on page 2-16 for Information that can appear In
the status line, and what that Information means.
Figure 2-3 shows you an example of a possible status line. The column numbers
below the status line tell you In which column a character appears. The characters
In the example are explained at the bottom of the figure.
S VT100 I=i-a31 > 3 <
12345678901234567890123456789012345678901234567890123456789012345678901234567890
1 2 3 4 5 6 7 8
Figure 2-3. Sample Status Line for a DEC VT100
Character Meaning
S Attached to the 3174
VT100 VT100 mode active
c3-a 31 Printer 31 assigned
> 3< LED number 3 Is lit
2-10 3174 Establishment Controller Terminal User's Reference for Expanded Functions

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English